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Finding the Fourth Proportional to 25.45, 35.08 and 20.55

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Solution

The fourth proportional to 25.45, 35.08 and 20.55 is: 28.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    25.45 : 35.08 = 20.55 : x
  2. Step 2: Convert to fraction form
    25.45/35.08 = 20.55/x
  3. Step 3: Cross multiply
    25.45x = 35.08 × 20.55
  4. Step 4: Simplify right side
    25.45x = 720.97
  5. Step 5: Solve for x
    x = 720.97/25.45
  6. Step 6: Final answer
    x = 28.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.